166431234348978 has 32 divisors (see below), whose sum is σ = 336881720964096. Its totient is φ = 54807237901968.

The previous prime is 166431234348961. The next prime is 166431234348979. The reversal of 166431234348978 is 879843432134661.

It is not an unprimeable number, because it can be changed into a prime (166431234348979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14638851 + ... + 23391417.

It is an arithmetic number, because the mean of its divisors is an integer number (10527553780128).

Almost surely, 2^{166431234348978} is an apocalyptic number.

166431234348978 is an abundant number, since it is smaller than the sum of its proper divisors (170450486615118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166431234348978 is a wasteful number, since it uses less digits than its factorization.

166431234348978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8790838.

The product of its digits is 501645312, while the sum is 69.

The spelling of 166431234348978 in words is "one hundred sixty-six trillion, four hundred thirty-one billion, two hundred thirty-four million, three hundred forty-eight thousand, nine hundred seventy-eight".